What problem does the BMW G8x differential mount solve?

The factory G8x differential assembly uses a single mounting point, which allows unwanted differential movement under hard acceleration, cornering, and track use. The MMX BMW G8x differential mount adds a second support point using the factory subframe location, locking the assembly down to sharpen power delivery, improve traction consistency, and prevent the differential and CV seal weeping that excessive movement causes over time.

Does installing the BMW G8x differential mount require dropping the differential fluid?

No. The BMW G8x differential mount retains the factory differential sump and installs without fluid removal, keeping the installation clean and straightforward.

Which bushing should I use with the BMW G8x differential mount?

The mount accepts the OEM rubber bushing (33 31 6 899 168) for a result that keeps NVH close to stock while still gaining stability; polyurethane and solid bushing options deliver progressively sharper driveline response at the cost of some additional NVH. The bushing is required to complete installation and is sold separately.

Will the BMW G8x differential mount make the car harsher on the street?

With the OEM rubber bushing, NVH stays close to stock. Polyurethane and solid bushings trade some comfort for sharper driveline response; the bushing choice lets the owner decide the NVH trade-off that suits their use.

Does the BMW G8x differential mount work with the MMX differential sump?

Yes. The BMW G8x differential mount and the MMX high-capacity baffled differential sump are designed to integrate cleanly with no additional hardware. Both are also available together with the output shaft heat shields in the Ultimate Differential Track Pack.

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Description

MMX Dual Differential Mount for G8x BMW M2, M3, and M4

BMW G8x differential mount from MMX Performance adds the second support point BMW left off the differential assembly on the G87 M2, G80/G81 M3, and G82/G83 M4. Under hard acceleration, aggressive cornering, and track use, the factory single-point mounting system allows unwanted differential movement, costing traction consistency, blurring driver feedback, and promoting the differential and CV seal weeping common to hard-driven G8x cars, where that movement fatigues the seals over time. The MMX BMW G8x differential mount is CNC-machined from 6061-T6 billet aluminum and uses the factory secondary mounting location already present in the G8x subframe, adding the critical second support point without any cutting, drilling, or permanent modification to the car. With the differential locked down by two mounting points instead of one, power delivery sharpens, driveline response becomes more immediate, and the mechanical loading that causes seal weeping is significantly reduced. Compatible with the OEM rubber bushing (33 31 6 899 168) for a near-stock NVH result, or polyurethane and solid bushing options for progressively sharper driveline response, the bushing is required and sold separately. Installation retains the factory differential sump with no fluid removal needed and is fully reversible at any time.

Features

Adds a critical secondary mounting point using the factory subframe location
No cutting, drilling, or permanent modification required
Reduces differential deflection for more consistent traction and crisper driveline response
Helps prevent differential and CV seal weeping caused by excessive movement
CNC-machined from 6061-T6 billet aluminum
Retains the factory differential sump; no fluid removal required during installation
Compatible with OEM rubber, polyurethane, or solid bushing options
Fully reversible installation
1-year manufacturer warranty against defects in materials and workmanship

Applications

BMW M2: G87 | 2023-present
BMW M3: G80, G81 | 2021-present
BMW M4: G82, G83 | 2021-present

Notes

Requires a differential bushing to complete installation (OEM or aftermarket, not included)
Professional installation recommended. Designed for both street and track use
Compatible with the MMX high-capacity baffled differential sump (MMR55-1600), or get both plus heat shields in the Ultimate Differential Track Pack (MMR55-1600KT).

Frequently Asked Questions

What problem does the BMW G8x differential mount solve? The factory G8x differential assembly uses a single mounting point, which allows unwanted differential movement under hard acceleration, cornering, and track use. The MMX BMW G8x differential mount adds a second support point using the factory subframe location, locking the assembly down to sharpen power delivery, improve traction consistency, and prevent the differential and CV seal weeping that excessive movement causes over time.
Does installing the BMW G8x differential mount require dropping the differential fluid? No. The BMW G8x differential mount retains the factory differential sump and installs without fluid removal, keeping the installation clean and straightforward.
Which bushing should I use with the BMW G8x differential mount? The mount accepts the OEM rubber bushing (33 31 6 899 168) for a result that keeps NVH close to stock while still gaining stability; polyurethane and solid bushing options deliver progressively sharper driveline response at the cost of some additional NVH. The bushing is required to complete installation and is sold separately.
Will the BMW G8x differential mount make the car harsher on the street? With the OEM rubber bushing, NVH stays close to stock. Polyurethane and solid bushings trade some comfort for sharper driveline response; the bushing choice lets the owner decide the NVH trade-off that suits their use.
Does the BMW G8x differential mount work with the MMX differential sump? Yes. The BMW G8x differential mount and the MMX high-capacity baffled differential sump are designed to integrate cleanly with no additional hardware. Both are also available together with the output shaft heat shields in the Ultimate Differential Track Pack.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK, often putting them through track validation, to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX Dual Differential Mount for G8X BMW M2 / M3 / M4 [MMR55-1606]

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MMX Dual Differential Mount for G8x BMW M2, M3, and M4

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Frequently Asked Questions

About MMX Performance

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